Question about 1999 Buick Century

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Loss of radiator fluid in cold weather...

1999 Century - 42,000 miles - Extreme loss of radiator fluid in sub-zero weather to the extent that it needs to be topped up every 30 miles or so driven (Maybe 12 -16 ounces lost each time). Absolutely no loss of radiator fluid when the temperatures remain day and night above freezing. No visible leaking of fluid (from the rad, the hoses, etc.), no sign of fluid in the engine oil, no smell of burning radiator fluids.

Interesting note: Even when freshly topped in cold weather, quick acceleration might activate the low coolant warning on the dashboard. Help?

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6 Suggested Answers

MNfisherman
  • 11896 Answers

SOURCE: 97 buick lasabre trans slips in overdrive

Either the cruise control is going out or the torque converter clutch circuit is going out on the trannys overdrive. Do you have check engine light codes? If so you will need to have a computer hooked up to read them. Darrel coleman also has a problem with his car like this and I have suggested the same thing to him

Posted on Apr 21, 2009

  • 42 Answers

SOURCE: my trans fluid is mixing with my radiator fluid, what can i do.

I hate to contradict the prior poster, but I would not see how a blown head gasket could get transmission fluid into the radiator. Motor oil, yes, but transmission fluid, no.

the transmission fluid in your tranny runs out of the transmission and up into the radiator to cool it off.

So if there is transmission fluid in the radiator, I'd look for a leak in the radiator. If it is mixing the two fluids then the leak is probalby internal.

Remember that if the radiator is now 'mixing' water and transmission fluid, there is a possibility that the fluid/water mixture may be going back into the transmission as well

Posted on May 16, 2009

  • 34 Answers

SOURCE: Suburban overheating and losing transmission fluid? Please help..

it could be a bunch of thngs but i would guess its the lower intake manifold.

Posted on Jul 17, 2009

carlsbiz
  • 1124 Answers

SOURCE: I have a 2001 Buick Century. I just had my

One good way to find where a coolant leek is coming from - is - when you get home and the car is good and warmed up - "hot".. Park it up on ramps if you have them.. Right after you shut it off - it will build even more pressure in the cooling system.. At this time car is off - open the hood and look (from under the hood and from under the car if you have ramps) for leeks,, listen for the "hissssss".. If the leek is just to small and/or to difficult to find - take it to a shop or oil change place for a compression test of the cooling system to locate the leek..

Hopefully its just a hose leek..


Good luck..

Posted on Sep 23, 2009

  • 1 Answer

SOURCE: oil mixing with coolant

If this is a 3800, Upper Intake Plenum or Lower intake gaskets are an inevitability. Head gaskets on these engines rarely go out! Seriously, don't get duped. I am doing the job on my grand prix right now. Google it for further explanation.

Posted on Oct 19, 2009

johnjnail
  • 1702 Answers

SOURCE: what type of coolant should I add to a 1999 Buick

gm put DEX- COOL in the car when it was built, but who know what has been done to it since then so you should probably go get some all makes all models anti-freeze you can get it a any auto parts store.......HAVE FUN

Posted on Jan 16, 2011

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